Cape Bounty East Lake, Melville Island, Canada 2840 Year Grain Size Data Lapointe, F.; Francus, P.; Lamoureux, S.F.; Saïd, M.; Cuven, S. Lapointe, F. Francus, P. Lamoureux, S.F. Saïd, M. Cuven, S. PAGES 2k Network PAGES Arctic 2k earth science/paleoclimate/paleolimnology (grain size class,sediment,null,micrometer,null,paleolimnology,null,null,N,Maximum disk apparent diameter) earth science/paleoclimate/climate reconstructions|paleolimnology (age,null,null,year Common Era,null,climate reconstructions|paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (grain size class,sediment,null,micrometer,null,paleolimnology,null,null,N,98th percentile of disk apparent diameter) earth science/paleoclimate/climate reconstructions|paleolimnology (precipitation,null,null,millimeter,null,climate reconstructions|paleolimnology,smoothed,null,N,precipitation of largest event per year; 15-year running median; based on sediment grain size) earth science/paleoclimate/climate reconstructions|paleolimnology (precipitation,null,null,millimeter,null,climate reconstructions|paleolimnology,null,null,N,precipitation of largest event per year based on sediment grain size) earth science/paleoclimate/climate reconstructions|paleolimnology (depth,null,null,centimeter,null,climate reconstructions|paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (grain size class,sediment,null,micrometer,null,paleolimnology,null,null,N,Median disk apparent diameter) earth science/paleoclimate/paleolimnology (grain size class,sediment,null,micrometer,null,paleolimnology,null,null,N,Standard deviation of the median disk apparent diameter) earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology (East Lake Cape Bounty>LATITUDE 74.92>LONGITUDE -109.55) Annual grain-size variation was measured on the varved (annually laminated) lacustrine sediment from Cape Bounty East Lake using an innovative image analysis system. About 7100 images were acquired using a scanning electron microscope and processed to obtain measurement of particles from 2845 varves. Several particle-size distributions indices were calculated and can be linked to high-energy sedimentary facies. Moreover, the coarse grain size (98th percentile) of these high-energy facies is strongly correlated with summer rainfall (and also summer temperature) of instrumental data from nearby stations. Particle-size distributions show a similar trend through time, especially for the standard deviation and the 98th percentile. Climatic reconstruction suggests that Cape Bounty recently experienced an unprecedented increase of rainfall events since ~AD 1920. On the other hand, changes in varve thickness are weakly correlated with the particle-size distribution. Altogether, these results highlight the need to obtain annual grain-size data to identify a meteorological signal. STUDY NOTES: Annual grain size data from sediment retrieved from East Lake, Cape Bounty, Melville Island, Canada for the past 2840 years. East Lake, Cape Bounty, Melville Island, Canada: 74.92°N, 109.55°W, 30m depth, 5m asl. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Lapointe, F. Investigator : Francus, P. Investigator : Lamoureux, S.F. Investigator : Saïd, M. Investigator : Cuven, S. 2012-06-30 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/13096 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/nu/east2012.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/nu/east2012.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/nu/east2012.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/nu/east2012.xls English https://www.ncdc.noaa.gov/paleo/study/13096 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/nu/east2012.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/nu/east2012.xls Lapointe, F., P. Francus, S.F. Lamoureux, M. Saïd, and S. Cuven. 2012. 1750 years of large rainfall events inferred from particle size at East Lake, Cape Bounty, Melville Island, Canada. Journal of Paleolimnology, Vol. 48, No. 1, June 2012, pp. 159-173. DOI: 10.1007/s10933-012-9611-8 START YEAR: 2840 cal yr BP * END YEAR: 0 cal yr BP -109.55 74.92 -109.55 74.92